Crank end play, destroyed converter, 408 nightmare

autoxcuda said
“Rapom alu heads 2.02 intake 1.60 exhaust valves 65cc”

What is a rapom aluminum head ?

At first you said reduce compression from 11.6 to 10.5. Later you said 10.6 to 10.5

What’s the orignal compression?

I see you are in Austria. What is the octane of the gas you run? Is European octane rating calculated 100% the same as US ?

Looking at 65cc and 4cc domed flattop piston in a 4” stroker makes me think you have way to much compression. But I don’t know how your gas compares.

I run your same cam with 9.7:1 measured cc’d compression. And with 91 octane it’s on the edge of pinging.

The advertised compression of motors in the 60’s did not actually measure that high. So running real 11:1 now is a lot different than running fake 11:1 back in the day with 100 octane gas

till now I filled it always with 98RON, this must be 93Pump in the US

wanted to change to the thicker cometic gasket that i can use 95RON (91Pump US) without worries also thought this could be also a reason why it ran so hot

this is my calculation with the new head gasket, but also just read on summit site that you shouldnt have a bigger quench than 0.060, the new cometic head gasket is 0.086 thick